2000 Ford F150--My defrost drains power from engine!

In a 1989 Ford F150 5.0, the location of the relays can vary depending on the specific model and trim level of the truck. However, in most cases, the relays are located in the engine compartment's power distribution box, which is usually located near the battery.
To locate the power distribution box, open the hood of your F150 and look for a black plastic box with a removable cover. The cover may have a diagram or label that indicates which relay controls which electrical system. In some cases, the relays may also be located in a separate relay box near the power distribution box.
If you're having trouble locating the relays, consult your F150 owner's manual, which should have detailed information about the vehicle's electrical systems and component locations. If you're still having difficulty finding the relays, it may be best to consult a qualified mechanic or Ford dealership for assistance.

If the anti-theft light is flashing, I would think it is a problem with the key or the anti-theft system. The system would kill the power to the fuel system.

For the 2000 Ford F150 4.2L V6:
Firing Order:
1-4-2-5-3-6
Cylinders:
........(back)........
|..3..|........|..6..|
|..2..|........|..5..|
|..1..|........|..4..|
.......(front)

Let me know if this helped...

The power point in the dash on the 2000 MY truck is engine compartment fuse panel, fuse #1, 20 A
You might be talking about the rear power point which is engine compartment fuse # 12, 20A
Passenger compartment fuse panel, fuse # 3 is for the cigar lighter & ODB-II port.
If you are talking about the power point, it is the engine compartment fuse panel ( could be both the power point and the cigar lighter were both out )

If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Also handy to have the PDF to search on keywords ( Ford calls the DC power ports, power points if you are searching ).

vacumn leak

Check the battery cables and connections.

there is not one near the fan i beleave this is not a relay you need to replace if your fan does not work you need to replace the resister whitch is a circuit board that is attached to the wire that plugs in to the blower motor

no there is a restster near the blower motor, but if it works on other settings but not defrost this would be a vacume problem

this sounds like the a/c compressor is locking up trying to stall engine. run the car with heater off, then turn on a/c or windshield defrost. if engine stalls (or almost) suspect faulty a/c compressor

if it is a 134a system the port should be on the right side near the drierit should have a blue cap on it the high side should be near the front of vehicle near the condensor. the low side pressur should be 30-35 psi high side should be 130-150psi. do you have quick connects?---are the gauges for 134a it should say on the face of the guage.